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Seasonal changes in the density and biomass of chironomid larvae were studied at 10 locations in Lake Kasumigaura for 4 yr from March 1982-April 1986. Tokunagayusurika akamusi and Chironomus plumosus were dominant at all stations. Clinotanypus sugiyamai was abundant at the centers of Tsuchiurairi and Takahamairi Bays as well as the center of the lake. On the contrary, Procladius culiciformis was distributed mainly at the innermost part of Takahamairi Bay. Larvae of Dicrotendipes sp., Glyptotendipes sp., Microchironomus sp., Polypedilum sp., and Stictochironomus sp. were also recovered from Takahamairi Bay and/or Tsuchiurairi Bay. Density of T. akamusi increased every 2 yr synchronously at all stations except for innermost-bay stations. Although this species emerges every autumn, many of the individuals presumably have 2-yr life cycle. There were three generations per year for C. plumosus, three for C. sugiyamai, and at least two for P. culici formis. C. plumosus density just before the emergence was lower for the summer generation than the winter generation. This was presumably due to the progressive eutrophication of Lake Kasumigaura. Chironomid production was extremely high during the winter. The annual production averaged for 10 stations and for 4 yr was 3.7 g dry weight·m-2·yr-1 for T. akamusi and 3.2 g dry weight·m-2·yr-1 for C. plumosus, 0.052 g dry weight·m-2·yr-1 for C. sugiyamai, and 0.006 g dry weight·m-2·yr-1 for P. culiciformis. Yet the values were underestimated for T. akamusi and C. plumosus. Annual production of both T. akamusi and C. plumosus increased from the innermost part of the bays towards their mouths or the lake outlet.

Density, Biomass, and Production of Chironomidae (Diptera) in Lake Kasumigaura during 1982-1986